From the article
"It may be that the authentication issues are a consequence of lack of ad visibility or payment in affected clients."
And Twitter has no one left to change the 401 Unauthorized code to 402 Payment Required? --->
"It may be that the authentication issues are a consequence of lack of ad visibility or payment in affected clients."
And Twitter has no one left to change the 401 Unauthorized code to 402 Payment Required? --->